Drilling-machine.



J. P. KARNS.

DBILLING MACHINE. APPLICATION, rlLnn nu 25. laos.

Patented Apr. 16, 1912.

SHEETS-SHBBT l.

mm Q

.ELE u(- ,f lllll .IIII

le ll fr l @Nanni zi J. P. KARNS.

DRILLING MACHINE.

APPLICATION FILED MAY z5, 1909.

Patented Apr. 16, 1912.

6 SHEBTB-SHEET 2.

atlocwnp Innrow. D. c.

J.P.KARN.S, DRILLING MACHINE.

APPLICATION FILED MAY 25, 190B,

1 ,023,654. Patented Apr. 16, 1912.

SHEETS-SHEET 3.

@gi/Zi 775200 Lumnm PLANonnAPn co..wAsHlNnTON n c J. P. KARNS.

DRILLING MACHINE.

APPLIoA'rIoN FILED MAY 25, 1909.

1 ,023,654. Patented Apr-.16, 1912.

6 BHEETBBHEBT 4.

l f 'g jg 732 x x W l@ l// 3mm J f l/ Gimmy J. P. KARNS.

DRILLING MACHINE.

APPLIUATIDN FILED MAY ze. 190s.

SHEET 5.

Y l d dimm Patented Apr. 16, 1912.

SHEETS J. P. KARNS.

DRILLING MACHINE.

APPLIUATION FILED MAY z5, 1909.

1,023,654. Patented Apr.16,1912.

JZ( 27 i4 ffy/z /J [ZZ j 1 f m W m w UNITED STATES;4

PATENT OFFICE.

JOHN PRUE KARNS, OF BOULDER, COLORADO, ASSIGNOR TO J'. P. KARNS TUNNELING- MACHINE CO., OF BOULDER, COLORADO.

DRILLING-MACHINE.

To all whom` it may concern:

Be it known that 1, JOHN Penn Kaars, a citizen of the United States, residing at Boulder, in the count y of Boulder and State of Colorado, have invented a new and useful Drilling-Machine, of which the following is a specification.

This invention has reference to improvements in drilling machines particularlT adapted for use in drilling tunnels, drifts, air-shafts, and the like.

The present invention is an improvement on the structure shown and described in Letters Patent #892,849 granted on July 7, 1908, on an application tiled b v me for improvements in drilling machines. In the structure shown in the said Letters Patent 'there is disclosed a drilling head capable of reciprocatory and rotary motion and designed to continuouslv drill a bore the full size of the desired tunnel. Reciprocatory motion is given to the head through a suitable shaft from a suitable source of power and the reciprocatorv movement of the shaft causes a slow step by step rotative movement. of the cutter head so that the cutters thereA on act continuousl)v on fresh surfaces. ln the structure shown in the said Letters Patent means are provided for sustaining and centering the shaft` with the Glitter heads thereon and for permitting the forward feeding of the device as occasion requires.

The present invention deals with a drilling machine of the same general character as that set forth in the said Letters Patent and its object is to improve the structure of the aforesaid machine in numerous particulars and to provide several novel features not found in the machine disclosed in the said Letters Patent.

ln the structure of the present invention the wheel hase of the supporting truck or carriage is materiallyT elongated over that shown in the said Letters Patent and the center of gravity of the reciprocating parts is carried well hachV of the forward end of the truck or carriage thus avoiding the necessit'v of countei-wcights to balance the weight of the drill head and other parts and materially improving the steadiness of the machine. This permits the omission of the forward set of bracing struts and the use of but one strut at the rear end of the truck or carriage for centering the machine.

The present invention presents improved Specification of Letters Patent.

Application filed May 25, 1909.

Patented Apr. 16,1912.

Serial No. 498,246.

constructions in the shaft bearings on the carriage or truck and an improved means for causing the step by step rotative movement of the shaft, and the present invention also presents features not found at all in the construction disclosed in the said Letters Patent, including the manner of coupling the drill head shaft to the power connection; in adjusting the supporting wheels of the carriage or truck individually with relation to said carriage or truck; in the means for actuating the centering strut, in providing a buffer for the return stroke of the reciprocating parts, and in other particulars.

The invention will be best understood from a consideration of the following detail description taken in connection with the accompanying drawings forming a part of this specification, in which drawings,

Figure 1 is a longitudinal central vertical section through a machine constructed in accordance with the present invention, some of the parts being shown in elevation. Fig. Q is an elevation of the end of the machine remote from the drilling head, with the connecting member between the power shaft and the source of power shown in section and with the drill head omit-ted. Fig. 3 is a section on the line AB of Fig. 1 with parts shown in elevation. Fig. 4 is a section on the line C-D of Fig. 1 with more remote parts omitted. Fig. 5 is a section on the line E-F of Fig. a with parts omitted. Fig. (i is a section on the line G-H of Fig. 1 with parts omitted. Fig. T is a displayed perspective of a portion of the cutter head shaft and of a bearing sleeve applied thereto. Fig. 8 is a longitudinal central section of the portion of the cutter head shaft shown at the right-hand end of Fig. 1. Figs. 9, 10 and 11 are detail views of portions of the structure shown in Fig. 8. Fig. 12 is a detail view showing the signal. lever. Fig. 13 is a cross section of one of the supporting legs, on the line 1-1 of Fig. 3. Fig. 14 is a perspective view of the buffer structure.

Referring to the drawings there isA shown a casting 1 constituting the body of the carriage or truck, substantially semi-circular in cross section and of general web construction. The carriage is provided at each end with bearings for a shaft 2 carrying at one end, which for convenience will be termed the front end, a drill. head 3, the

construction of which latter will not be described in any detail since the said drill head forms the subject matter of another application Serial No. 498,244, tiled May 25, 1909, t'or cutter head for tunneling machines, and1 so far as the present invention is concerned, this drill head may be substantially the same as that described in the aforesaid patent.

It may be stated that the drill head 3 is ot' heavy construction adapted to resist the action ol" the blows delivered against the breast of the tunnel being drilled and the whole structure of the drill head, carriage, shaft and supporting parts is massive and is designed to deliver heavy blows which will rapidly disintegrate rocli torn'lation so that the action of the machine as a who-le is relatively rapid.

The reciprocating parts ot' the machine are made very heavy so that advantage may be taken of the inertia of these reciprocating parts for causing a` powerful impact blow on the breast of the tunnel.

The supporting parts for the shaft and drill head are constructed not only with reference to strength and durability but also with reference to accessibility for inspection. care, and repair.

The carriage 1 is formed with a casing l'or the shaft at each end of said carriage. At the forward end of the carriage there are formed three parallel spaced and inwardly directed ribs 4, 5. rising slightly `trom the bed of the carr'age and contorniing to the general semi-circular shape thereof. Each rib is formed along its inner face with a ball race 'T in the torni of a groove.

The ribs al, 5, 6, constitute the lower member of a journal casing.y the upper member 8 of which is a semi-cylindrical casting having inwardly directed radial spaced ribs 9, 10. ll, matching the ribs 4, 5, o'. and each provided with a ball. race l2 like the ball race 7 ot' the matching race. The joining web of the journal cap 8 between the ribs 9, l0, l1, has its counterpart in the rounded sides of the carriage bo-dy 1 between the ribs 4, 5, 6, so that this portion of the carriage when the cap member S is in place constitutes a cylindrical journal casing. The meeting edges ot the carriagl-i 1 and the cap member S are formed with lateral anges lil and lil respectively and are formed with respective grooves l5 and tongues iti, holding the two members in true cylindrical arrangement. Suitable bolts 17 extending' through the flanges serve to secure the parts together in removable relation.

long one side of the carriage l and projecting from the flange 13 are ears 1S and formed on the corresponding side of the cap member S are matching ears lt) and these ears are connected by a pivot pin 20 so that by removing the bolts 1T the cap member S may be turned about the pivot pin 20 as a hinge and thereby expose the interior of the journal casing for ready access thereto and avoiding the necessity of lifting the cap member 8 bodily from the base member on the journal casing, this being particularly advantageous in structures ot this character, especially when such access is desirable or necessary while the machine is within a tunnel.

The ribs al and (3 and also the ribs 9 and l1 are formed on their laterally outer faces with inwardly directed flanges 21 and housed within the journal casing and held against longitudinal movement therein is a cylinder t'ormed on its outer surface with circuinterential ribs 23, these ribs matching the ribs 4 and 9, 5 and 10, 6 and ll respectively and each of the ribs 23 being formed with a ball race 24 matching the ball races 7 and l2. The cylinder 22 is supported within the journal casing by series of antit'riction balls 25 lodged in the respective ball races. Access to these ball races is had through suitable passages 26 in the cap member 8 coincident with the ball races and. each passage 26 is normally closed by a screw plug 27, this arrangement facilitating the introduction of the balls into the ball races and preventing accidental escape of the balls therefrom. The cylinder 22 is thus prevented from longitudinal movement both by the fianges 2l and the balls 25 but may turn t'reely within the journal casing because of the anti-friction support furnished by the series of balls 25.

The inner wall of the cylinder 22 is vformed with a` circular series of equally spaced longitudinal grooves 28 extending throughout the length of the inner wall ot' the cylinder and open at the ends thereof,

these grooves being also of equal depth throughout and each curved 1n cross section on the saine radius. The ends of the cylinder 22 carry rings 29 closing the ends of the grooves 2S and held to the cylinder in a manner hereinafter described with reference to the showing of other tigures and particularly to that of Fig. 5.

The drill head 3 is provided with an extended hub 30 formed adjacent to the rear face of the drill head with a shoulder 3l and trom the shoulder' to the rear end of the hub the latter is of reduced diameter. The hub S0 receives the front end of the shaft 2 which is ot a suitable diameter to snugly lit into thc hub and this shaft extends to a point within the drill head 3. The shaft 2 near the front end is formed with a diametric slot 32 and matching slots are formed through the walls ofthe hub 30 as indicated at 33. The hub and shaft are secured firmly together by a wedge key 34 having its narrow end formed with asthreaded stem 35 to which is applied a nut 36 held in adjusted positions by a nutJ lock 37. The key is also held in place b y a strap 3S passed over its wider end and held in the same manner as another strap for a like purpose at the other end of the shaft and which will be described hereinafter with reference to Fig. 2.

The rear end of the reduced portion of the hub 30 abuts against an annular [lange 39 formed on the shaft Z and between the annular flange 39 and the shoulder 31 the reduced portion of the hub il() carries a sleeve 40 which may be secure-d to the hub 3() by being shrunk thereon. The outer surface of the sleeve 40 is provided with a circular series of longitudinal grooves ll matching the grooves Q8 in the cylinder QQ and in cross section these grooves` are curved on the same radius as the grooves Q8. The grooves 41 extend from end to end of the sleeve 40. Seated in thevmatching grooves 28 and 41 are balls 1Q holding the cylinder Q2 and sleeve 40 in concentric but spaced relation so that there is an annular space between the adjacent surfaces of the cylinder and sleeve. The space between the outer surface of the sleeve Ll1 and the inner surface of the cylinder 2Q is sufficient for the introduction of a cylindrical ball cage 43 maintaining the balls -ll in spaced relation j and it is shorter than either the sleeve 4Q or cylinder Q2 so that the sleeve Ll0 may travel longitudinally with relation to the cylinder Q2 without interference for a purpose which will j'iresently appear.

By the construction described extensive antifriction bearings are provided for both the longitudinal and the rotary motion of the shaft and this is advantageous because of the massivcness of the structure.

The annular flange 39 on the shaft Q is flattened on opposite sides as indicated at 44 and the reduced portion of the hub 3() provided with oppositely disposed wings or continuations 45 with the facing portions parallel and adapted to receive the flat portions 44 of the flange 39. The sleeve 40 is provided with like wings or extensions 4G exterior to the wings 45 and flattened at the facing ends so as to engage the flat portions 44 of the flange 39. Then the parts are assembled the flat portions 44 of the flange 39 will fit in between the facing portions of the wings and Ll0 so that the slot is brought into alinement with the slots 33 in the hub 30. Furthermore, the wings 45 and 41" serve to prevent the shaft 2 from turning in the hub 30 and so the key 3l is relieved from any shearing action which might be present if the key were relied upon to prevent the turning of the shaft in the hub or the turning of the cutter head on the shaft.

At the other or rear end of the carriage 1 there is formed another journal bearing for the shaft Q and this journal bearing is of less bulky structure than the one at the front end of the carriage since the main portion of the weight of the movable part of the drilling machine is sustained by the front bearing, the central line of gravity of the reciprocating parts being located about at the rear end of the front bearing.

The carriage body l atV the rear end is formed with two spaced ribs 4T, 4B. like the ribs 4 and G of the front journal bearing, and these ribs are curved in conformity with the curvature of the side walls of the carriage body 1. These ribs are provided with hall races l() and side flanges 50 like the ribs 4 and The top of the rear journal casing is formed of a cap member 51 having inwardly directed ribs corresponding to the ribs 9 and 11 of the cap member S and these ribs are provided with ball races 5l and end flanges like the ball races and flanges of the ribs f) and 11.

'The rear journal bearing is best shown in Figs. Q and` (i taken in connection with Fig. 1. lt will be observed that the lower member of the journal casing formed on the earriage 1 and also the cap member 51 are formed with ears 5U and 57 respectively on one side at the meeting edges and these cars are connected by a pivot rod or pin 5S so that the cap member 51 hinged to the lower member of the journal casing as is the case with the journal casing at the front of the carriage. The meeting edges of the two members of the journal casing are provided with longitudinal flanges 5l) and G0 respectively, and these flanges receive bolts 6l for securing the cap member and lower member of the journal casing together.

W'ithin the rear journal casing is housed a` cylinder GQ like the cylinder Q2 and formed on the outer surface at the ends with circuu'lferential radially extending ribs GC like the ribs Q3 on the cylinder Q2. The ribs (i3 match the ribs 52 and` of the cap member 5l and the ribs 'll' and Ll-S of the basic member of the journal easing and are provided with ball races (A eoacting with the ball races 54 and containing series of anti-friction balls (5.\ The ball races in the cap member 51 have passages leading thereto normally closed by screw plugs (lf3 like the screw plugs 27.

Formed on the inner face of the cylinder Q4 is a circular series of equally spaced lon gitudinal grooves GT extending from end to end of the cylinder and closed at the ends by rings GS held in place elastic-ally by means such as described with reference to the showing of Fig. 5 hereinafter.

That portion of the shaft l extending through the cylinder (l2 is increased in di; ameter as indicated at GS and the exterior surface of the portion U8 of the shaft is formed with a circular series of equally tra spaced longitudinal grooves Gt) matching the grooves formed on the inner face of the cylinder (3Q. These grooves receives .series of halls 'T0 and the cross sectional curvature of the grooves is such that the halls hold the inner surface of the cylinder ('32 away from the outer sl'irface of the enlargement (38 of the shaft i2 so as to form an annular space between them in which space there is lodged a cage Tl maintaining the halls 7() in proper spaced relation and this cage is shorter than the length of either the cylinder (i2 or the shaft enlargement tS so that the balls may move longitudinally along either the enlargement or the cylinder as the case may he. The balls however cannot escape from the grooves because of the rings GS.

Formed on the carriage l in spaced relation to the rib @t7 and disposed away from the same toward the front of the machine is a web T2 radial to the axis of the shaft 2 and partially embracing the saine. Formed on the cap member .El is a matching' weh T3 spaced from said cap member by a continuation Tl of the cylindrical portion of .said cap member 5i. rlhe webs T2 and 73 surround the shaft 2 and constitute a wall spaced away from the front end of the portion of the cap member 5l inclosing the cylinder G2 a distance little more than half the total extent of travel of the shaft 2 on its longitudinal axis along the carriage l.

Surrounding the shaft i? innnediately in front of the wall made up of the webs T2 and 73 is a huffer ring 75 either made of ruhher or otherwise rendered elastic and it of rubber this ring is spaced with a plate TG having a central opening for the pas-age of the shaft Q. The plate TG is si'lpported on a boss 'TT formed on the carriage body l adjacent to the web T. The plate Ttl and butler T5 may be secured to the structure in any suitable manner so that the shaft may pass freely tluuethrough. ly dividing the ring 76 and buffer block T5 in two parts the said parts may be secured to the web T2 and the web 73 respectively so that the cap plate 51 may he turned upon its hinges when desired carrying the web T3 with the portion of the buiier structure secured thereto with it, thus avoiding vthe necessity of unfastening the buffer structure when it is desired to gain access to the interior of the journal casing.

Formed on the shaft 2 in front of the butter is an annular head TS having the face adjacent to the corresponding face of the plate TG parallel therewith so as to engage the buffer when the shaft is moved longitudinally toward said buffer.

The inner faces ofthe wehs and T3 are formed with bosses. surrounding the openingl formed for the passage of the shaft Q` and these bosses together form a non-elastic bumper T5 in the path of the enlargement (38 on the forward or active stroke of the shaft. Under normal conditions the cutter head will contact with the breast of the tunnel before the enlargement GS contacts with the bumper However, should the operator fail to advance the machine to the breast of the tunnel it will be noted thatI this bumper T5' will limit the forward movement. of the shaft thus preventing the shaft to be so far advanced as to permit the piston of the engine which reeiprocates the shaft from taking out the front heads of the cylinders. On the back stroke the elastic buffer 75 through its contact with the boss 78 will prevent the shaft from forcing the pistons back to an extent which would injure the rear heads of the engine cylinders.

To the rear of the enlargement 68 the shaft 2 is reduced to its normal diameter and terminates at a short. distance to the rear of the enlargement 681, being formed at itsl rear end with a semi-spherical recess 79 having fitted thereinto a semi-spherical block 80, preferz'ibly of bronze and provided with a short frusto-conical extension 8l, the said block 80 constituting a bearing ball having a Seat in the semi-spherical recess 75).

Surroumiling the rear extension of the shaft is a sleeve 82 extending from the enlargement S to a. poi nt beyond the rear end of the rear extension of the shaft and there inturned to form a circular' ledge S3 the inner edge of which forms the walls of an axial passage S-t through which extends a connectingmember 85 in the form of a round bar coming` from a suitable actuating mechanism capable of imparting reciprocating motion to the har S5 but which forms no part of the present invention and is therefore not shown in the drawings. An electric. compressed an: or other suitable engine may be used for the purpose. The inner wall of the inwardly directed flange 83 is formed with a curved lseat SG for a ring bearing Si' having one wall plane and the other wall curved into conformity with the curvature of the seat; 8G. Lodged between the outer face of the frusto-conical extension of the ball S0 and the plane face of the bearing ring' 8T is a cylindrical head 88 formed on the end of the rod S5 and having parallel plane faces engaging respectively the plane face of the hearing ring 8T and the outer plane face of the frusto-conical extension of the ball S0, the sleeve S2 being somewhat enlarged internally at this point to form a chamber between the inner wall of the flange S8 and the outer end of the shaft 2 for the accomniodation of the head SS and the bearing members embracing the same.

Extending through the rear portion of the shaft Q at a point somewhat in fronty of the socket T9 is a diametric slot 89 n'iatching |siniilar slots in the wall of the sleeve 82 and extending through these slots is a taper key 91 having` its wider end formed With a recess for the reception of a bar or rod 92 having its ends threaded and extending through ears 93 formed on opposite sides ot the sleeve 82 and there receiving nuts 94. the middle portion of the rod engaging the key 91 and holding the same in place. lreterably two nuts 91 are applied to each end ot the rod 92 so that one nut will lock the other in place against accidental displacement. The rod 3S before referred to and the rod 92 are practicall)Y the same as to shape.y t'unction, and mode of attachment.

Since there is considerable relative motion between the end of the shaft 2, the ball S0, the head S8, the ring 8T and the seat S0. the ball 80 may be provided with lubricant directing grooves 95. the head on its contacting faces with lubricant directing grooves 90, and the bearing ring 87 on its engaging faces with lubricant directing grooves 97. The chamber housing the head 8S and adjacent parts will operate as a lubricant reservoir. 1t will be observed that the cur 'ature et the socket T9 and of the bearing S0 are from the same center, the connection between the rod 95 and the shatt 2 being therefore in the nature of a ball and socket joint.

Between the flange 39 and the head 78 the shaft is formed with another cylindrical enlargement 98 and in the outer surtace o1 this enlargement are t'orined longitudinal grooves 99 slightlyY pitched with relation to the longitudinal axis of the shaft 2. the pitch or inclination of these grooves in the direction of their lengths being only about the width of one of the grooves. ln practice a pitch of tive degrees tor the grooves 99 is found suiicient. but the pitch of these grooves ma)1 be varied in accordance with circumstances and in accordance with the size and weight ot the machine.

The enlargement 98 is inclosed b v a c vlinder 100 which ma)T be of web construction with interior webs or fianges 101 shaped to Jform longitudinal grooves 102 matching and pitched to the same degree as the grooves 99. iVithin the matching grooves 99 and 102 are lodged balls 1037 the cross sectional curve of the grooves and the diameter of the balls and also the diameters of the enlargement 9S and the cylinder 100 being so related that there is an annular space between the outer surface of the enlargement 9S and the inner edges of the webs ot the cylinder 100. this space being provided for a ball cage 104 holding and spacing the balls. but this ball cage is of less length than the length ot' the enlargement 98 and cylinder 100.

The ends of the grooves 102 are closed by rings 105 held in place by bolts 100 passing through the rings and through the end. webs of the cylinder 101. The inner ends oi the bolts 106 have nuts 10T applied thereto and these nuts are elongated on one side to engage the inner face ot the cylinder 100 so as to prevent the bolts from turning, the said nuts being secured to the bolts by cotter pins 108 or other suitable means.

Between the nut 10T and the inner tace ot the corresponding end web of tbe c vlin` der 100 each nut is surroulufled by a` spring 109 and exterior to the ring 105 each bolt is provided with nuts 110` two nuts being provided so that one nut will act as a lock nut for the other. The bolt 106 with the spring 109 holds the plate 105 elasticallyY so that a blow directed against the inner tace ot a ring will cause the saine to move slightly ontw-.trib the rings thus acting as vielding retainers for the balls.

The rings 29 and 0S of the tront and rear bearings respectively are held in place in the same manner, that is with spring held bolts similar to the bolts 100.

At the ends oitl the cylinder 100 on the exterior thereof are circun'iterential ribs 111 provided with ball races 112 and the carriage body 1 is provided wit h spaced ribs 113, 1141, similar to the ribs t and 0 of the front journal casing. These ribs are provided with ball races 115 and with end flanges 116. The carriage body 1 between the ribs 113 and 114 at the upper edge on one side provided with ears 117 and along both edges with lateral fianges 11 S. This portion of the carriage 1 is provided with a cap member 119 provided with cars 120 matching the ears 117 and connected there to by a hinge rod or bolt 121 so that the cap member may be turned back out of the way about the hinge rod 121. Bolts 122 serve to secure the cap member to the base member of the casing surrounding the cylinder 100. (')n the inner face of the cap member 119 there are formed inwardlv directed ribs 123 matching the ribs 11?, and 114 and provided with ball races 121 n'iatching the ball races in the cylinder 100. These ball races are filled with suitable anti-friction balls 125 and access to the ball races is had through suitable passages in the cap member 119 normall)IY closed by screw plugs 126.

Extending about the middle portion ot the cylinder 1 and projecting radially outward therefrom are ratchet teeth 12T arranged in a continuous series and all having their abrupt shoulders located on the like sides of all the teeth. The ratchet teeth 127 are quite wide in the direction of the iongitudinal axis of the cylinder 109 so that numerous teeth may be employed without sacrifice of strength.

For a` distance circumterentiall)T about the cap member 19 the walls thereof are doubled as indicated at 128 and these walls are lioined by radial. webs 129 so that the walls in close a series ot chambers 130 arranged cireumterentially. The outer and inner walls of these chambers are pierced by radial slots 131 in line one with the other and extending in the direction of the longitudinal axis of the shaft 2 to agree with the width of the ratchet teeth 127. The slots 131 are provided for the passage of gravity pawls 132 snugly but freely fitti-ng the slots 131 and having their inner ends shaped to engage the ratchet teeth 127. The pawls are undercut on each face near the outer ends as indicated at 133 to facilitate handling. The double wall section 128 of the cap member 119 affords ample support for the pawls while the chambers 13() reduce the area of sliding contact between the pawls and their supports thus causing the pawls to respond more freely than tliough they were in frictional contact along their entire length with the walls of the guide-Ways.

At suitable points along the radially eX- tended portion 128 are ears 134 receiving a rod 135 held in place by nuts 136 and this rod engages in recesses 137 formed in the outer ends of the pawls 1327 the rod 135 thus operating as a retaining member for the pawls but at the same time permitting movementof the pawls sufieient to clear the ratchet teeth 127 as needed.

In the drawings there are shown nine pawls 132 equi-distantly disposed and all radial to the axis of the shaft 2, but this number of pawls is by no means mandatory and may be made greater or smaller as desired. The number of teeth may be proportional to the number of pawls 132 and the arrangement usually employed is to have the ninnber of pawls and the number of ratchet teeth so related that but one ratchet tooth is in engagement actively with a pawl at any one time while the relation of the pawls to the teeth is such that these pawls engage the teeth in progressive order throughout the series of pawls. Thus a rotative movement of the cylinder 100 in the proper direction need be but a small fraction of the length of a ratchet tooth to cause the engagement of a pawl with a ratchet tooth Without lost motion or back lash.

The grooved enlargement 9S together with the ratchet. cylinder 100 and the pawls 132 constitute a feeding mechanism for caus ing a rotative movement of the drill head 3 by the longitudinal reciprocation of the shaft 2.

Then the shaft 2 is moved forward on its active stroke to bring the drill head 3 into engagement with the breast of the tunnel, the shaft because of its great Weight and the weight of the parts carried thereby has no tendency to turn on its longitudinal axis and therefore will move straight forward. The cylinder 100 however is held by the ribs 113, 1111 and 123 against participating in this forward movement of the shaft 2. The result is that there is a tendency to move the grooves 99 out of coincidence with the grooves 102, but thus is prevented by the balls 103 and therefore there is imparted to the cylinder 100 a rotative movement on its longitudinal axis commensurate with the longitudinal movement of the shaft 2 and the pitch of the grooves 91) and 102.

To an observer viewing the structure as shown in Fig. 4 the twist or pitch of the grooves fll and 102 is counterclocliwise and consequently on the forward movement of the shaft 2 there is imparted to the cylinder 100 a clockwise movement causing the ratchet teeth 12T to ride idly under the pawl 32 to an extent c(numensurate with the rotative movement imparted to the cylinder 100.

In the particular instance shown n'here there are nine pawls and sixty ratchet teeth a rotative movement of t\vo-tl1irds of a degree is the smallest active feed of the cylinder 100. lVhen the shaft 2 is being retracted then the tendency is to rotate the cylinder 100 counter-clockwise but under these circumstances thel cylinder 100 is held against movement by some one of the pawls 132 and consequently the shaft itself and parts carried thereby is given a rotative movement upon the longitudinal axis of the sha ft agreeable to the initial rotative movement of the cylinder 100 so that on the next forward or active movement of the shaft the cutters carried by the drill head 3 are brought into engagement with fresh surfaces of the breast of the tunnel. The rotative movement imparted to the shaft 2 may be great or small depending upon the longitudinal movement of the shaft and the correspondingr rotative movement of the cylin der 100.

The number of pawls 132 and the number of teeth 12T and the relation between these pawls and the teeth may be varied with different sizes of machines and consequently the showing of the drawings is to be taken as indicative only and not mandatory.

The shaft 2 has considerable range of longitudinal movement througl'i the carriage body 1J it being shown in Fig. 1 at about the median point of this range of travel.

The carriage is mounted upon wheels or rollers 137 at the ends of the carriage beneath the journal bearings thereon and because of the cylindrical shape of the bore of the tunnel these wheels are set radial to the axis of the Shaft 2. Each wheel 137 is provided with a circumferential groove 133 midway between its ends and this groove is designed to receive a guiding rib or strip 139 secured centrally and longitudinally on track plates 1%1-0 adapted to rest on the floor of the tunnel and longitudinal thereof in proper spaced relation to receive the wheels 137 with the peripheries thereof engagingr the upper face of the track 140. The guiding strip 139 is preferably made separate from the track members 140 and is bolted or riveted thereto, but it is evident. that these parts may be rolled out in one piece if so desired. The tracks lett) are niade in comparatively short sections and each section is provided with eyes 141 on one side so that the track sections may be joined together by rods .or pipes 142 into suitable lengths. The track sections 1-'10 are made suieiently long and wide to forni a broad bearing snrface so that only four wheels 137 are needed even for a large structure, there being two wheels at each end on opposite sides of the median line of the structure.

To support the wheels the carriage 1 is provided at opposite sides of the two ends below the journal bearings tor the shaft .2 with downwardly extending legs 143 shown in Figs. 1, 2, 3 and (l. The legs 143 are parallel one with the other and are formed with guide grooves 144 extending vtroni near the top to the bottoni thereof. .Each leg is provided with a cover plate 145 having a central oppesitely inclined ott-set 146. Housed in each leg is a hollow casting 14T shaped to engage the guide grooves 141 and having at. its lower end an outwardly inclined yoke 14S normally radial to the axis of the shaft. 2. The legs of the yoke are formed with passages for a pin 149 upon which is mounted a roller or wheel 1ST and this wheel may Carry a bushing 15G of bronze or other suitable material. Each end ot each pin ift-9 extends beyond the yoke 148, and is there provided with a lateral recess 151 in which is seated one edge of a plate 152 fast on the corresponding yoke arm. This plate serves to hold the pin against rotation and also against longitudinal inovement.

Because ot the inclined or annular position of the yoke 148 with reference to the casting 14T the yoke is connected to the casting by a strenggtllening` rib 15?) and it is to prevent interference with this strength ening rib when moving' the casting 14T lengthwise of the corresponding leg` 143 that the outwardly inclined portion 146 ot the cover plate of the leg is provided.

The interior of the casting1 147 is hollow to forni a chamber 154 and the upper end ot this chamber is open and counter-sunk as indicated at 155.

Resting on the upper end of the castingr 14T is a plate 156 provided with a central extension 15T and through this plate liti and extension 157 is a passaee provided with internal screw threads 10S.y the said plate and its extension therebyv constituting;l a nut. The nut receives the threaded end of a screw 159 of the jack screw type having near one end a circniniercntial tif-inge pro vided with radial teeth 16() and beyond the head 1GO the jack screw 15S) is continued in the forni of a stem 1111 having formed near its free end a eircuiuterential flange 1F12. The hanged end ot the screw enters a socket 163 tornied in a` lateral boss 10i projecting from the side of the casting 1 in line with the corresponding leg;r tti-l. plate lith applied to the under tace ot the boss itil and .suitably secured thereto serves to maintain the cerresiendingV end ot' the jack screw 159 in the socket 1G23. set screw 106 threaded through the boss 1G11- inay be nioved into engagement with the end ol' the jack screw 15S) within the recess 11121 and thereby lock the screw against turning'. rthe upper end of the jack screw bears against a wea ring;f plate '16T seated in the recess 16?. The space between the boss it and the upper end ot a leg 143 is ainple space for the manipulation ol a wrench applied to the teeth 1GO ot the Yiack screw so that. the latter may be turned as desired to eai'ise the elevation or depression of the machine with rt'ilierence to the supporting wheels. ity a` proper manipulation of the jack screws 159 each casting 14T with its wheel 13T may be adjusted with rclation to the truck or carriage body 1 individually and thereby the whole. structure may be leveled or adjusted at will with the greatest facility.

The cap ineniber nl of the rear liournal casingl of the shaft provided at its upper central portion with a cylinder 1li? in which there is fitted a piston 1TH on one end ot a piston rod 169 extending' beyond the upper end nl the cylinder lli' through a cylinder bead 170 tastY to the upper end ot the c vlinder by ineans of suitable screws Vl T1 and eentrally bored tor the passage ot the piston rod 169. The upper end of the pieton rod is shouldered and provided with a truste-eenieal coiitinuation 11'2` entering the central portion ot' a voke ITS and secured thereto by a key 174. The yoke 173 earrics a journal pin 1T?) for a roller lill shaped to engage the root of the tunnel. The lower end of the cylinder lt is entered bv a pipe ITT coming' troni a .suitable sourec ot' tiuid supply under pressure.

Formed on the connectingl web TT are two spared parallel ears 17S and iournaled in these ears is a bar or lever 17) entering' the chamber formed between the webs T2 and T3 and the corresiliondine' end ot the rear journul bearingl and the inner end oli thislever is in the path of the enlargement GS ot' the shaft Q.

The general operation ot the .structure described is the saine as that set forth with reterenee to the structure shown vin the aforesaid Letters Patent. rl'be drill head fl is adjusted to the breast o'l the tunnel being bored with the carriage l in proper relation to the sai-d drill head and slia'l't 3. rThe drill bead and .shaft are propcrlv leveled or otherwise adjusted by a` suitable manipulation ot' (gli the jack screws 159 and fluid under pressure introduced into the elvlinder 167 thua,l

ings exterior to and supporting said hub and in which the huh i5 axially and rotatably moving the roller liti into auch forcible enl movable, and a power Shaft entering and Segagement with the` roof of the tunnel be desired.

Un the inner tact-s ot' the Webs TQ and are formed hoeses Surrounding the opening formed tor the passage ot' the shaft 2, and these horses together form a bumper 75 in the path ot' the enlargement GS on the t'orward or activo Stro-lu' ot' the Shaft. The inner Walls of the webs 72 and 73 are reinforeed h v Strengthening rito@ or otherwise.

The butler T5 reeeives the hack stroke ot the machine and h v the power thus stored aeeiste in the forward rohe; it aleo prevents the pieton striking the hack end of the cylinders; ot` the engine should there he in- Snllicient cushioning in the driving engine.

The bumper T5 is designed to reeeive the tor 'ard `ati-oke of the machine Should the operator tail to properlyv feed the machine and the Cutter head therefore tail to strike the breast ot the tunnel. This will prevent Ieuch a long forward Stroke ot the machine aS to hring the pieton ot the oj'ierating engine againet the front cylinder head and therehj' either injuring or actuall)v driving the cvlin der head out.

The lever litt in engaged h v the enlargement VIS ot the shat't before it engagea the humper and no transmits a signal to the operator indicating Where the stroke in and whether or not he t'eeding the machine eutlieientlj'.

The Single AStrut at the rear hearing of the machine and the universal connection he tween the drive Shat't and the shaft Q compensate for lack ot' alinenient between the main shaft and the drive hatt ST So that it is unneeessartY to ret the driving engine with itel pieton in perteet alinement with the main Shaft Q for should it happen that the engine pieton and the main ahat't are Sonie- What out ot alinenient the operation ot the maehine will not he atl'eeted. The univernal connection also permita the operation of the machine at a Slight angle to the engine #o that a gradual turn may he formed in the tunnel.

lhat is claimed isnl. ln a drilling machine, a drill head provided with an elongated huh, a power shat't entering said huh and Carrying the drill head. a bearing sleeve carried h v Said hub exterior thereto, and journal hearings for Said Sleeve.

Q. In a drilling machine, a reeiproeatory drill head provided with an elongated huh, a hearing sleeve carried bv the huh exterior thereto, and journal hearings surrounding- Said Sleeve and in which the sleeve is axially and rot atahlxr movable.

il. ln a drilling machine, a drill head provided with an elongated hub, journal bearas ma)7 eured to the huh for imparting rotative and reeiproeatory movement to the drill head.

l-. ln a drilling machine, a drill head provided with a huh elongated in the direction remote from the active tace of the drill head, a sleeve carried h v the hub, arotatable o vlinder surrounding the Sleeve, Connection@ between the Sleeve and cylinder permitting the sleeve to move axiallyT in the Cylinder, but constraining the cylinder and Sleeve to rotate about the longitudinal axis of the sleeve simultaneously, and a Support for the cylinder in which the latter is rotatable and h v which the cylinder is held against movenient in the direction ofthe longitudinal axis of the sleeve. i

5. In a drilling machine, a drill head provided With an elongated huh terminating at the tree end in opposed Wings or extenSions, a sleeve carried hy and exterior to the huh, a shaft entering the huh and provided with a circumferential flange with opposite flat sides adapted to enter between the wings or extensions ot the huh and Sleeve, and a jonrnal hearing exterior to the'sleeve and in which the Sleeve, huh and shaft are rotatively and longitudinally movable,

(l. ln a drilling machine, a drill head having an elongated huh, a Shaft entering the huh and Connected thereto and provided to the rear of the portion entering the hub with cylindrical enlargementl provided with longitudinally disposed grooves, a forward journal bearing exterior to the elongated huh ot' the drill head, a rear journal hearing sun-oundingg and coaeting with the rearmost; grooved enlargen'ient ot the shaft, means c0- aeting with the intermediate grooved enlargement of the shaft l'or imparting rotative movenxent to the shaft, and a truck or carriage carrying the journal bearing and the means enacting with the intermediate enlargement on the shaft.

T. In a drilling machine, a drill head, a shaft carrying the Same and capable of longi4 tudinal movement, and provided at an intermediate point with a head or enlargement, a truck or earriage having journal hearings tor the Shaft at the ends of the carriage, and an elastic butter mounted on the carriage in front of and in spaced relation to the rear hearing and in the path of the head or enlargement on the Shaft.

8. In a drilling machine, a drill head, a Shaft carrying the Same, a carriage carrying the shaft and drill head, and under Supports jfor the carriage comprising guides formed on the carriage on either side of and in parallel relation to the central vertical plane of the carriage, and independent supports in the guides movable therein in parallel relation one to the other, Said supports terminating in rollers radially disposed with relation to the longitudinal axis of the drilling machine.

9. In a drilling machine, a drill head, a

l shaft carrying the same, a truck carrying the shaft and drill head, and supports for the end of the truck remote from the drill head comprising radially disposed rollers individually adjustable in planes parallel one to the other, and a thrust member above the truck and adjustable in a plane intermediate of and parallel with the planes of adjustment of the rollers.

10. In a drilling machine, a drill head, a shaft carrying the same, a journal bearing for the shaft formed of two members one of which is hinged to the other and a buffer for the shaft having a part carried by the hinged member of the journal bearing.

11. In a drilling machine, a drill head, a sha ft carrying the same, and a truck or earriage having a body portion provided With journal bearings for the shaft and with substantiallyr parallel legs, sliding members mounted in the legs and each having an angle extension, a Wheel or roller carried by the angle extension, and means for adjusting the sliding blocks in thc carriage legs individually, and a truck for the shaft and drill head having individually adjustable rollers for supporting the truck.

In testimony that I claim the foregoing as my own, I have hereto aliXed my signature in the presence of two witnesses.

JOHN PRUE KARNS.

Witnesses JOHN Davis, Borre S'rno'rHER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

